button in 2D Surface tab, 
command under 
button in Display tab or Type->Surface->Filled Art command from main menu, context menu or display dedicated colour bar context menu.4.3.2 Filled Art Display
Filled Art display is the Lines Art kind of display with solid filled cells.
Filled Art display can be invoked with button in 2D Surface tab, command under button in Display tab or Type->Surface->Filled Art command from main menu, context menu or display dedicated colour bar context menu.
Depending on the display options for Filled Art display, which can be changed in the 2D Surface Parameters panel, the following pictures can be obtained:
Basic discrete display.
Smooth colours display.